Value Inheritance i variant classes

Hi

I woudl like to inherit values from a root class

PRODUCT

     Char COLOUR

     THING_CLASS

        COLOUR - blank

          DIMMENSION

I can't seem to get the value to COLOUR of THING_CLASS unless i make a procedure on the configuration profile of the material with THING_CLASS

Is there some way to make THING_CLASS always get value from $Root other than configuration profil, I tried to put an dependency on the class but it didn't work. I would like not having to assign procedures to all configuration profiles.

Thanks in advance